For those Americans unnerved by the popularity of social media sites such as Facebook and Twitter, a new study from the University of Michigan will come as little surprise, the Chicago Tribune reports. And it might even add some smugness. The gist of the study: Narcissists “like” Facebook and Twitter. A lot. And social media in general “reflect and amplify” our culture’s deepening narcissism. … The study found that narcissistic college students prefer Twitter, using it as “a megaphone” for their lives. Older adults, meanwhile, use Facebook more as a mirror, the researchers said. They curate their image, using frequent status updates and then gauging how people react to their updates, photos, etc.